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Positive Meniscus Lenses And Negative Meniscus Lenses

The Positive Meniscus Lenses are a convex-concave lens, but it is thicker at the center than at the edges. They are felt polished and are used universally in the ophthalmic industry where convention dictates that lens power be specified in Diopters.

The Negative Meniscus Lenses are a convex-concave lens, but it is thinner at the center than at the edges. Otherwise description is similar to Plano Concave lenses.
  • product origin:

    China
  • shipping port:

    Fuzhou China
  • lead time:

    4 working weeks
  • payment:

    T/T Payment, Western Union
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  • description

1. What's the advantages of using Meniscus Lenses?


It produce a smaller focal point and fewer aberrations than a standard plano-convex lens and enhance image quality.

 

2. What is Meniscus Lens?


Meniscus lenses have two curved surfaces,convex on one side and concave on the other side. It is thicker at the center than at the edges. When a meniscus lens is combined with another lens, the focal length is shortened and the numerical aperture of the system is increased.

 

3. What's the applications of Meniscus Lens?


Negative meniscus lenses are often used for Infrared Application. These lenses are used as an alternative to other negative lenses with a greater curvature on the concave side and a smaller curvature on the convex side. 


Meniscus Lenses Meniscus Lenses


Meniscus Lens Capabilities

Material:
Grade A optical glass or Fused Silica
Dimension Tolerance:
±0.1mm(Standard), ±0.05mm(High Precision)
Center Thickness Tolerance:
±0.1mm(Standard), ±0.05mm(High Precision)
Focal Length:
±2%
Surface quality:
60/40(Standard), 20/10(High Precision)
Clear Aperture:
>85%
Surface Figure:
λ/2(Standard), λ/4(High Precision) @633nm
Centration:
3 arc minutes
Bevel:
<0.25mm×45°
Coating:
Upon requirement


Part No. Material F(mm) Φ(mm) R1(mm) R2(mm) Tc(mm) Te(mm) Fb(mm)
ULMN100254 BK7 100 25.4 33.72 90 4 2.5 97.5
ULMN125254 BK7 125 25.4 38.47 90 4 2.8 121.8
ULMN150254 BK7 150 25.4 42.52 90 4 3 146.3
ULMN175254 BK7 175 25.4 46.05 90 4 3.1 171.2
ULMN200254 BK7 200 25.4 49.03 90 3.5 2.8 197
ULMN250254 BK7 250 25.4 83.96 235 3.5 2.9 246.5
ULMN300254 BK7 300 25.4 94.08 235 3.5 3 296.3
ULMN500254 BK7 500 25.4 123.9 235 3.5 3.2 495.4
ULMN100254N BK7 -100 25.4 90 32.59 3 4.5 -99.2
ULMN125254N BK7 -125 25.4 90 37.26 3 4.2 -123.7
ULMN150254N BK7 -150 25.4 90 41.42 3 4 -149.5
ULMN175254N BK7 -175 25.4 90 44.86 3 3.8 -174.6
ULMN200254N BK7 -200 25.4 90 47.84 3 3.7 -199.6
ULMN300254N BK7 -300 25.4 235 93.13 3 3.5 -298.3
ULMN500254N BK7 -500 25.4 235 122.6 3 3.3 -496.5
ULMN600254N BK7 -600 25.4 600 204.08 3 3.2 -596.8



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1.  Germanium (Ge)


Germanium (Ge) is the preferred lens and window material for high performance infrared imaging systems in the 8–12 μm wavelength band. Its high refractive index makes Ge ideal for low power imaging systems because of minimum surface curvature. Chromatic aberration is small, often eliminating the need for correction.

 

Crystallographic properties
Syngony Cubic
Crystal Form Poly or Single Crystal
Lattice Constant 5.66
Cleavability <111>, non-perfect
Molecular Weight 72.6
Physical properties
Density, at 20 °C 5.33
Hardness, Mohs 6.3
Dielectric Constant for 9.37 × 109 Hz at 300 K 16.6
Melting 937
Thermal Conductivity, W/m·K at at 293 K 59
Thermal Expansion, 1/K at 298 K 6.1 × 10-6
Specific Heat Capacity, J/(kgK) at 273-373 K 0.074
Bandgap, eV 0.67
Knoop Hardness, kg/mm2 800
Youngs Modulus, Gpa 102.66
Shear Modulus, GPa 67.04
Bulk Modulus, GPa 77.86
Debye Temperature, K 370
Poissons Ratio 0.278
Elastic Coefficient C11=129, C12=48.3, C44=67.1
Apparent Elastic Limit 89.6 MPa (13000psi)
Chemical properties
Solubility in water None
Solubility in acids Soluble
Molecular Weight 72.59

2. Silicon (Si) 


Silicon (Si) is grown by Czochralski pulling techniques (CZ) and contains some oxygen that causes an absorption band at 9 microns.To avoid this, material can be prepared by a Float-Zone (FZ) process. Optical silicon is generally lightly doped (5 to 40 ohm cm) for best transmission above 10 microns, and doping is usually boron (P-type) and phosphorus (N-type). After doping silicon has a further pass band: 30 to 100 microns which is effective only in very high resistivity uncompensated material.
 
CZ Silicon is commonly used as substrate material for infrared reflectors and windows in the 1.5-8 micron region. The strong absorption band at 9 microns makes it unsuitable for CO2 laser transmission applications, but it is frequently used for laser mirrors because of its high thermal conductivity and low density. Application as window, lens in the 1.5 - 8 um region; Mirror for CO2 laser and spectrometer applications.
 

Crystallographic properties
Syngony Cubic
Lattice Constant, A 5.43
Physical properties
Density 2.33g/cm3
Hardness, Mohs 7
Dielectric Constant for 9.37 x 109 Hz 13
Melting point, оС 1414
Thermal Conductivity, W/m·K at 313 K 163
Thermal Expansion, 1/K at 293 K 2.6x10-6
Specific Heat Capacity, J/(kg°C) 712.8
Bandgap, eV 1.1
Knoop Hardness, kg/mm2 1100
Youngs Modulus, Gpa 130.91
Shear Modulus, GPan 79.92
Bulk Modulus, GPa 101.97
Debye Temperature, K 640
Poissons Ratio 0.28
Chemical properties
Solubility in water None
Molecular Weight 28.09

3、ZnS material:


ZnS MultiSpectral Under intense heat and pressure, defects within the crystalline lattice are virtually eliminated, leaving a water-clear material with minimal scatter and high transmission characteristics from 0.4 to 12 microns. This material is particularly well suited for high-performance common aperture systems that must perform across a broad wavelength spectrum.

Specifications:

Material: ZnS MultiSpectral
Diameter Tolerance: --------------------- +0.0, -0.1mm
Thickness Tolerance: -------------------- ±0.1mm
Clear Aperture: ---------------------------->85%
Parallelism: -----------------------------------3 arc minute
Surface Quality: ----------------------------80-50 scratch and dig
Wavefront Distortion: -------------------- λ /2 per 25mm @633mm
Bevel: -----------------------------------------Protective  (<0.2mm x 45° )
Coating: -------------------------------------- Optional (Uncoated, AR Coating, etc.)


4. ZnSe material


ZnSe is a preferred material for lenses, windows, output couplers and beam expanders for its low absorptivity at infrared wavelengths and its visible transmission. For high-power applications, it’s critical that the material bulk absorption and internal defect structure be carefully controlled, that minimum-damage polishing technology be employed, and the highest quality optical thin-film coatings are used. The material absorption is verified by CO2 laser vacuum calorimetry. Our quality assurance department provides testing and specific optics certification on request.

ZnSe is non-hygroscopic and chemically stable, unless treated with strong acids. It’s safe to use in most industrial field, and laboratory environments.



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